Examine source code of orchid black background

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "orchid black background",
  "theme": {
    "images": {
      "theme_frame": "orchid.jpg"
    },
    "colors": {
      "frame": "#4F555C",
      "tab_background_text": "#000"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f47798e-72d9-4bb0-ae29-a7c25ac4d704}"
    }
  }
}